3-12
Finisher Service Manual
4024-110
Punch unit
This section describes the media punching operation of the punch.
Two types of punch are provided: the 2/3-hole type and the 2/4-hole type.
The following explains the 2/3-hole type (2-hole/3-hole auto-switching).
Every type has the same construction, except for the sensor (punch hole select) that is provided for the 2-hole
type and 3-hole type only.
Adjusting punching positions
The punching positions from the media edge in the direction of feed are determined by gently pressing the
media against the three punch media stopper assemblies.
While the three punching positions from the media edge in the direction of media width are determined by the
following method.
•
Activate the punch carriage shift motor assembly and move the punch to the front side until the sensor
(punch carriage shift HP) turns “L”.
•
Rotate reversely the motor and move the punch to the rear side until the sensor turns “H” to determine the
home position.
•
The punch carriage shift motor assembly is activated to move the punch to the front until the sensor (punch
unit side registration 1) and the sensor (punch unit side registration 2) detects the media edge, and then
the punch is further moved to the front according to the pulse-number determined by the media size. (The
punch carriage shift motor assembly stops at this position.)
Sensor (punch carriage shift HP)
Punch carriage shift motor assembly
Sensor (punch unit side reg 2)
Sensor (punch unit side reg 1)
Punch unit motor
Sensor (punch unit motor encoder)
Sensor (punch unit HP)
Sensor (punch
hole select)
Sensor (punch cam front)
Содержание W850dn
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